US7286511B2 - System and method for an IEEE 802.11 access point to prevent traffic suffering bad link quality from affecting other traffic - Google Patents

System and method for an IEEE 802.11 access point to prevent traffic suffering bad link quality from affecting other traffic Download PDF

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Publication number
US7286511B2
US7286511B2 US10/289,979 US28997902A US7286511B2 US 7286511 B2 US7286511 B2 US 7286511B2 US 28997902 A US28997902 A US 28997902A US 7286511 B2 US7286511 B2 US 7286511B2
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Prior art keywords
transmission
packet
packets
station
queue
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Expired - Fee Related, expires
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US10/289,979
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US20040090915A1 (en
Inventor
Zhun Zhong
Marc Portoles
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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Assigned to KONINKLIJKE PHILIPS ELECTRONICS N.V. reassignment KONINKLIJKE PHILIPS ELECTRONICS N.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PORTOLES, MARC, ZHONG, ZHUN
Priority to AU2003274466A priority patent/AU2003274466A1/en
Priority to JP2004549454A priority patent/JP2006505995A/ja
Priority to CNB2003801026827A priority patent/CN100438486C/zh
Priority to EP03758441A priority patent/EP1563645A2/en
Priority to KR1020057007936A priority patent/KR20050059330A/ko
Priority to PCT/IB2003/004779 priority patent/WO2004043016A2/en
Priority to TW092130861A priority patent/TW200428822A/zh
Publication of US20040090915A1 publication Critical patent/US20040090915A1/en
Publication of US7286511B2 publication Critical patent/US7286511B2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/52—Allocation or scheduling criteria for wireless resources based on load

Definitions

  • the present invention relates to communications systems. More particularly, the present invention provides a system and method for an IEEE 802.11 Access Point (AP) to prevent traffic suffering bad-link-quality from over occupying the channel and affecting other traffic. Most particularly, in the system and method of the present invention an AP identifies the traffic suffering from bad link quality and dynamically controls channel access to restrict the effect of bad-link-quality in an IEEE 802.11 local area network (LAN) environment.
  • AP IEEE 802.11 Access Point
  • the basic service set is the fundamental building block of an IEEE 802.11 LAN.
  • Each BSS consists of at least two stations.
  • Two types of networks are supported: the Infrastructure BSS and the Independent BSS.
  • the Infrastructure BSS stations communicate via a central AP.
  • the central AP receives traffic from a source station and relays it to a destination station.
  • each station communicates with others directly, without the assistance of an AP.
  • an AP also provides access to the distribution system (DS), connecting a wireless network with external networks (Ethernet LANs, Internet, etc.). Therefore, the Infrastructure BSS is used to implement enterprise networks that require such connectivity.
  • the Independent BSS can readily be employed to establish an ad hoc network.
  • a typical Infrastructure BSS is illustrated in FIG. 1 , in a BSS of three stations 103 served by an AP 102 that is connected to an Ethernet Switch 101 .
  • the wireless stations 103 communicate with one another via the AP 102 and can access resources in a wired external network 100 via the AP 102 , which has another interface 101 to the wired external network.
  • the wireless stations 103 can, for example, download files or stream video from the server(s) 100 that are connected to the wired network.
  • the sender waits for an acknowledgement from the intended receiver. If the acknowledgement is not received after a certain time has elapsed, i.e., a timeout occurs, the sender assumes that the previous packet did not reach the receiver. The sender retransmits the packet and again waits for an acknowledgement. When no acknowledgement is received, the sender repeats the send-packet/wait-for-acknowledgement procedure until a pre-determined retransmission limit is reached. When this limit is reached, the sender gives up and the transmission is considered to have failed.
  • a transmission error can occur for a variety of reasons, very often caused by a bad wireless link condition.
  • the link condition can go bad gradually as when a wireless station moves away from an AP, e.g., during handoff. Or, the link condition can go bad all at once, which occurs less commonly, as in the case when the wireless station is terminated abruptly during a transmission. Even when the station is not moving or terminated, the link condition can still fluctuate significantly over a short period of time due to small scale fading of the wireless channel.
  • all down stream traffic from the network server(s) 100 to the wireless stations must be forwarded by an AP 102 . That is, the AP 102 is responsible for forwarding the traffic from the server(s) 100 to the destination wireless stations and since there is only one wireless media, all traffic addressed to different wireless destination stations must compete for access to the media to reach their destination stations.
  • the AP 102 will not be able to reach the station while trying to deliver a packet. Due to the retransmission policy, however, the AP 102 diligently attempts to deliver the packet and retransmits over and over until a pre-determined retransmission limit is reached. As a result, the effective bandwidth consumed by the bad link increases multi-fold. This increase in bandwidth usage comes at the expense of other traffic whose share of bandwidth decreases correspondingly. The net effect is that the quality of traffic on good links suffers because of the increased traffic on the bad link. Instead of one packet being transmitted, multiple packets are transmitted in a futile attempt to deliver the packet over the bad link.
  • the present invention provides an apparatus and method that restricts traffic on a bad link at the driver level 301 of the wireless interface 300 , illustrated in FIG. 3 , without requiring any change to the underlying IEEE 802.11 LAN transmission protocol.
  • the system and method of the present invention sets an upper limit per destination station on the maximum number of packets that can be buffered by the network interface driver transmit queue, e.g., 304 and thereby achieves an upper limit on the number of packets that can exist in this device, i.e., card 302 , that are competing for the wireless medium.
  • the present invention puts a per-destination limit on the number of packets the driver can pass to the network interface device 302 , which in a preferred embodiment is a network interface card 302 .
  • the network interface device 302 which in a preferred embodiment is a network interface card 302 .
  • the AP observes transmission failure and this restriction is tightened on this link by lowering the limit for this particular destination.
  • the AP observes transmission success and this restriction is relaxed by increasing the limit for this particular destination.
  • the network driver 301 of the network interface 300 dynamically controls the flow of packets into the network interface device 302 , limiting the packets addressed to a station having a bad link and thereby reducing the effect of one bad link on other traffic competing for bandwidth over the wireless medium and controlled by the same AP.
  • FIG. 1 illustrates a typical wireless local area network WLAN for an Infrastructure BSS connected to an external network.
  • FIG. 2 is a flow diagram of a preferred embodiment of the present invention.
  • FIG. 3 illustrates a wireless interface of an AP according to the present invention.
  • the present invention is a system and method for reducing the impact of bad links between an AP and wireless stations on other traffic competing for bandwidth over the wireless medium by dynamically manipulating the limit on the number of packets that can be queued in the AP for transmission to a given wireless station. If the link between the AP and a station is good, the limit is set to a pre-determined maximum. If the link degrades and a transmission error, this maximum is reduced in a pre-determined way to limit the impact of retransmissions on other traffic being handled by the AP.
  • the preferred embodiment places a limit on the number of consecutive errors that can occur on a link and dissociates a station once that limit is exceeded. Further, if the link keeps going bad during a series of packet transmissions to a wireless station, the system and method of the present invention only allows one packet to be queued for transmission until the link is consistently good.
  • FIG. 2 is a flow of the logic of a preferred embodiment of the system and method of the present invention and FIG. 3 shows a preferred system for implementing this logic in the wireless driver of a wireless interface 300 of an AP 103 .
  • the wireless interface 300 comprises a wireless interface driver 301 interfaced to a wireless interface card 302 .
  • the wireless interface driver has an active queue for each active station i, j, . . . (Q_i 305 for station i, Q_j for station j, . . . ) and a shared TX queue 304 for holding a number of packets pkt_i+pkt_j+ . . . for all stations i, j, . . .
  • the system and method of the present invention begins at any point in time by obtaining the next event to process at step 200 , determining the type of event and taking an appropriate action as follows:
  • the next event is then obtained at step 200 and the process repeats.
  • the active station index i is set to wireless station STA at step 205 and if the number of station i's packets already placed into the TX queue 304 waiting to be passed to the device 302 is greater than or equal to max_pkt_i at step 206 , the packet is queued in Q_i 304 at step 203 . The next event is then obtained at step 200 and the process repeats. If the number of station i's packets already placed into the TX queue 304 waiting to be passed to the device 302 is less than max_pkt_i at step 206 ,
  • the number of successful transmissions tx_ok_i is checked to see if a pre-determined minimum number of consecutive successful transmissions MIN_CONSEC_OK has been exceeded at step 216 and, if not, the maximum number of packets that can be place into the TX queue for station i, max_pkt_i, is set to one at step 217 and in either case the number of consecutive successfully transmitted packets tx_ok_i is set to zero at step 218 and stage 2b above is performed.
  • the maximum number of packets max_pkt_i that can placed in TX queue 305 for station i is dynamically set to the minimum of twice the previous value for this maximum number of packets and the predetermined value MAX_TX_QUEUE_LEN at step 222 (so that this value never exceeds MAX_TX_QUEUE_LEN).
  • the number of consecutive packet transmission errors tx_err_i is set to zero at step 223 and stage 2b above is performed. Otherwise the event is not recognized and the next event is obtained at step 200 and the process repeats.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Small-Scale Networks (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephonic Communication Services (AREA)
US10/289,979 2002-11-07 2002-11-07 System and method for an IEEE 802.11 access point to prevent traffic suffering bad link quality from affecting other traffic Expired - Fee Related US7286511B2 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US10/289,979 US7286511B2 (en) 2002-11-07 2002-11-07 System and method for an IEEE 802.11 access point to prevent traffic suffering bad link quality from affecting other traffic
EP03758441A EP1563645A2 (en) 2002-11-07 2003-10-27 System and method for an ieee 802.11 access point to prevent traffic suffering bad link quality from affecting other traffic
JP2004549454A JP2006505995A (ja) 2002-11-07 2003-10-27 不良なリンク品質にあるトラフィックがその他のトラフィックに影響することを防止するためのｉｅｅｅ８０２．１１アクセス・ポイント用のシステムおよび方法
CNB2003801026827A CN100438486C (zh) 2002-11-07 2003-10-27 用于ieee 802.11接入点以防止链路质量差的业务影响其它业务的系统和方法
AU2003274466A AU2003274466A1 (en) 2002-11-07 2003-10-27 System and method for an ieee 802.11 access point to prevent traffic suffering bad link quality from affecting other traffic
KR1020057007936A KR20050059330A (ko) 2002-11-07 2003-10-27 패킷 트래픽 조절 장치 및 패킷 트래픽 조절 방법
PCT/IB2003/004779 WO2004043016A2 (en) 2002-11-07 2003-10-27 System and method for an ieee 802.11 access point to prevent traffic suffering bad link quality from affecting other traffic
TW092130861A TW200428822A (en) 2002-11-07 2003-11-04 System and method for an IEEE 802.11 access point to prevent traffic suffering bad link quality from affecting other traffic

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US10/289,979 US7286511B2 (en) 2002-11-07 2002-11-07 System and method for an IEEE 802.11 access point to prevent traffic suffering bad link quality from affecting other traffic

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US20040090915A1 US20040090915A1 (en) 2004-05-13
US7286511B2 true US7286511B2 (en) 2007-10-23

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US (1) US7286511B2 (zh)
EP (1) EP1563645A2 (zh)
JP (1) JP2006505995A (zh)
KR (1) KR20050059330A (zh)
CN (1) CN100438486C (zh)
AU (1) AU2003274466A1 (zh)
TW (1) TW200428822A (zh)
WO (1) WO2004043016A2 (zh)

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US20060126617A1 (en) * 2004-12-15 2006-06-15 Cregg Daniel B Mesh network of intelligent devices communicating via powerline and radio frequency
US20080192765A1 (en) * 2007-02-12 2008-08-14 Jong-Sang Oh Apparatus and method for packet buffer management in IP network system
US7558818B2 (en) * 2003-06-06 2009-07-07 Meshnetworks, Inc. System and method for characterizing the quality of a link in a wireless network
US20100238793A1 (en) * 2003-01-23 2010-09-23 Research In Motion Limited Methods And Apparatus For Re-Establishing Communication For Wireless Communication For A Wireless Communication Device After A Communication Loss In A Wireless Communication Network
US8644177B2 (en) 2010-12-16 2014-02-04 Blackberry Limited Methods and apparatus for use in controlling data traffic for a wireless mobile terminal using a wireless access point (AP)
US9232615B2 (en) 2012-07-03 2016-01-05 Smartlabs, Inc. Simulcast mesh dimmable illumination source
US9425979B2 (en) 2014-11-12 2016-08-23 Smartlabs, Inc. Installation of network devices using secure broadcasting systems and methods from remote intelligent devices
US9474133B2 (en) 2014-12-01 2016-10-18 Smartlabs, Inc. Sensor lighting control systems and methods
US9531587B2 (en) 2014-11-12 2016-12-27 Smartlabs, Inc. Systems and methods to link network controllers using installed network devices
US9529345B2 (en) 2013-12-05 2016-12-27 Smartlabs, Inc. Systems and methods to automatically adjust window coverings
US9578443B2 (en) 2014-12-19 2017-02-21 Smartlabs, Inc. Smart home device adaptive configuration systems and methods
US9628422B2 (en) 2013-07-12 2017-04-18 Smartlabs, Inc. Acknowledgement as a propagation of messages in a simulcast mesh network
US9754483B2 (en) 2013-10-28 2017-09-05 Smartlabs, Inc. Methods and systems for powerline and radio frequency communications
US9985796B2 (en) 2014-12-19 2018-05-29 Smartlabs, Inc. Smart sensor adaptive configuration systems and methods using cloud data
US11489690B2 (en) 2014-12-19 2022-11-01 Smartlabs, Inc. System communication utilizing path between neighboring networks

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EP1986378B1 (en) * 2006-02-16 2015-10-14 NEC Corporation Quality-degraded portion estimating device, quality-degraded portion estimating method, and quality-degraded portion estimating program
JP4841353B2 (ja) * 2006-08-02 2011-12-21 富士通株式会社 データ通信方式
US8767530B2 (en) * 2007-02-07 2014-07-01 Futurewei Technologies, Inc. Hierarchical processing and propagation of partial faults in a packet network
CN100596086C (zh) * 2008-01-10 2010-03-24 上海交通大学 无线语音传输局域网的自适应传输间隔接入控制方法
JP5919727B2 (ja) * 2011-10-26 2016-05-18 富士通株式会社 バッファ管理のためのプログラム、中継装置及び制御方法
CN105472692B (zh) * 2015-12-07 2020-11-27 中兴通讯股份有限公司 一种网络接入控制方法和网络设备
CN106888174A (zh) * 2015-12-15 2017-06-23 西安中兴新软件有限责任公司 一种数据传输方法和多ssid路由器
US10880870B2 (en) 2017-01-09 2020-12-29 Huawei Technologies Co., Ltd. Methods and systems for transmitting operating channel indicators
KR20200001824U (ko) 2019-02-08 2020-08-19 김주희 실내외 겸용으로 사용할 수 있는 싱크대가 설치된 캠핑카

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Cited By (24)

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US20100238793A1 (en) * 2003-01-23 2010-09-23 Research In Motion Limited Methods And Apparatus For Re-Establishing Communication For Wireless Communication For A Wireless Communication Device After A Communication Loss In A Wireless Communication Network
US8295817B2 (en) 2003-01-23 2012-10-23 Research In Motion Limited Methods and apparatus for re-establishing communication for wireless communication for a wireless communication device after a communication loss in a wireless communication network
US7558818B2 (en) * 2003-06-06 2009-07-07 Meshnetworks, Inc. System and method for characterizing the quality of a link in a wireless network
US20060126617A1 (en) * 2004-12-15 2006-06-15 Cregg Daniel B Mesh network of intelligent devices communicating via powerline and radio frequency
US20080130673A1 (en) * 2004-12-15 2008-06-05 Smartlabs, Inc. Network of intelligent devices communicating via powerline and radio frequency
US8081649B2 (en) 2004-12-15 2011-12-20 Daniel Cregg Network of intelligent devices communicating via powerline and radio frequency
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US20080192765A1 (en) * 2007-02-12 2008-08-14 Jong-Sang Oh Apparatus and method for packet buffer management in IP network system
US8121035B2 (en) * 2007-02-12 2012-02-21 Samsung Electronics Co., Ltd. Apparatus and method for packet buffer management in IP network system
US8644177B2 (en) 2010-12-16 2014-02-04 Blackberry Limited Methods and apparatus for use in controlling data traffic for a wireless mobile terminal using a wireless access point (AP)
US9232615B2 (en) 2012-07-03 2016-01-05 Smartlabs, Inc. Simulcast mesh dimmable illumination source
US9401763B2 (en) 2012-07-03 2016-07-26 Smartlabs, Inc. Simulcast mesh dimmable illumination source
US10594398B2 (en) 2012-07-03 2020-03-17 Smartlabs, Inc. Multi-media communication device
US10181902B2 (en) 2012-07-03 2019-01-15 Smartlabs, Inc. Multi-media communication device
US9755744B2 (en) 2012-07-03 2017-09-05 Smartlabs, Inc. Simulcast mesh dimmable illumination source
US9628422B2 (en) 2013-07-12 2017-04-18 Smartlabs, Inc. Acknowledgement as a propagation of messages in a simulcast mesh network
US9754483B2 (en) 2013-10-28 2017-09-05 Smartlabs, Inc. Methods and systems for powerline and radio frequency communications
US9529345B2 (en) 2013-12-05 2016-12-27 Smartlabs, Inc. Systems and methods to automatically adjust window coverings
US9531587B2 (en) 2014-11-12 2016-12-27 Smartlabs, Inc. Systems and methods to link network controllers using installed network devices
US9425979B2 (en) 2014-11-12 2016-08-23 Smartlabs, Inc. Installation of network devices using secure broadcasting systems and methods from remote intelligent devices
US9474133B2 (en) 2014-12-01 2016-10-18 Smartlabs, Inc. Sensor lighting control systems and methods
US9578443B2 (en) 2014-12-19 2017-02-21 Smartlabs, Inc. Smart home device adaptive configuration systems and methods
US9985796B2 (en) 2014-12-19 2018-05-29 Smartlabs, Inc. Smart sensor adaptive configuration systems and methods using cloud data
US11489690B2 (en) 2014-12-19 2022-11-01 Smartlabs, Inc. System communication utilizing path between neighboring networks

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TW200428822A (en) 2004-12-16
AU2003274466A1 (en) 2004-06-07
JP2006505995A (ja) 2006-02-16
WO2004043016A2 (en) 2004-05-21
KR20050059330A (ko) 2005-06-17
CN1711723A (zh) 2005-12-21
AU2003274466A8 (en) 2004-06-07
EP1563645A2 (en) 2005-08-17
US20040090915A1 (en) 2004-05-13
CN100438486C (zh) 2008-11-26
WO2004043016A3 (en) 2004-10-21

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